I figured this may be useful for players:
Mwun can be spawned by all players but it will ideally need at least 2/3 people to do so, i would recommend 4-5 people.
In order to spawn mwun there are 5 sacred boxes that need to be opened in a particular order at time 0. Once these have been unlocked, an NPC called “MWUN” will spawn in a random location. This NPC must be clicked in order to spawn the might 'Mystical Warlock Ultimate Negamare'. REMEMBER this process must be completed BEFORE time 1! So that gives you 10 minutes!
Sacred Barrier Coords-
They must be opened in this order.
1. ) 51,413 (Earth Golem Area)
2.) 7,33 (Top Left)
3.) 204,17 (Near NPC Elron)
4.) 224,436 (Below the Apai/Akah)
5.) 137,209 (Warp In Point)
Mystical Warlock Ultimate Negamare - (230,100)
You will find a lot of Demonray in the area near where mwun will spawn, these must be killed as they will weaken your character and as a result may die in 1 hit.
Next it is normally recommended that you kill all the Nightmares that are in range, so that they don’t eat your hp while you fight MWUN.
Now lure out MWUN away from the Millennia Apai that will also spawn.
-Kill MWUN in a group with at least 1 person slowing it at all times.
-It is weak only to melee, magic does 1 damage.
-It has high defence dex so you will need to use accuracy set if your dex is not high.
MWUN drop list:
Mare Blood – Upgrades into either Keen Eye or Swift Spirit
Muscle Elixir - +5 Weight
Energy Elixir - +5 Stamina
Mind Elixir - +3 MP
Sacred Aura Spirit – You need 2 of these to gain 5th aura in your chosen skill. You take the 2 sacred aura spirits to NPC scattered around VoD to get 5th auras.